Detect Cisco Unified Communications Manager SSRF Exploitation Detected in Microsoft Sentinel
Detects exploitation attempts of CVE-2026-20230, a Server-Side Request Forgery (SSRF) vulnerability in Cisco Unified Communications Manager (CUCM). An unauthenticated remote attacker may craft malicious HTTP requests to the CUCM web interface to cause the server to initiate requests to arbitrary internal or external destinations, potentially enabling internal network reconnaissance, credential theft via metadata services, or pivoting to internal resources.
MITRE ATT&CK
KQL Detection Query
let cucm_ssrf_indicators = dynamic(["169.254.169.254", "metadata.google.internal", "100.100.100.200", "localhost", "127.0.0.1", "::1", "0.0.0.0"]);
let cucm_ssrf_paths = dynamic(["/ccmadmin/", "/cucm-uds/", "/ucmuser/", "/ccmuser/", "/cmplatform/"]);
CommonSecurityLog
| where TimeGenerated >= ago(24h)
| where DeviceVendor =~ "Cisco" or DeviceProduct has_any ("Unified Communications Manager", "CUCM", "Call Manager")
| where Activity has_any (cucm_ssrf_paths) or Message has_any (cucm_ssrf_paths)
| extend RequestURL = coalesce(RequestURL, Message)
| where RequestURL has_any (cucm_ssrf_indicators)
or (RequestURL matches regex @"(?i)(file://|dict://|gopher://|ftp://|ldap://)")
or (RequestURL matches regex @"(?i)/api/.*url=|/redirect.*=http|callback=http")
| extend SourceIP = SourceIP, DestinationIP = DestinationIP
| project TimeGenerated, SourceIP, DestinationIP, RequestURL, Activity, Message, DeviceVendor, DeviceProduct, AdditionalExtensions
| order by TimeGenerated descDetects SSRF exploitation attempts against Cisco CUCM by identifying requests to CUCM web paths that contain internal/metadata service indicators or suspicious URI schemes in CommonSecurityLog events.
Data Sources
Required Tables
False Positives & Tuning
- Legitimate administrative scripts that fetch internal URLs for health checks
- Vulnerability scanners or penetration testing tools performing authorized assessments
- Integration workflows that legitimately redirect through CUCM APIs to internal services
- Monitoring agents polling CUCM endpoints that resolve to RFC1918 addresses
Other platforms for CVE-2026-20230
Testing Methodology
Validate this detection against 3 adversary techniques from Atomic Red Team. Each test below lists the behaviour to exercise and the telemetry you should expect to see. Executable commands and cleanup steps are available with Pro.
- Test 1SSRF Probe via CUCM Admin Interface URL Parameter
Expected signal: HTTP GET request to /ccmadmin/ with redirectUrl parameter containing 169.254.169.254; subsequent outbound TCP connection from CUCM server to 169.254.169.254:80 if vulnerable
- Test 2SSRF via Gopher Protocol Scheme in CUCM API Parameter
Expected signal: HTTP GET to /cucm-uds/ endpoint with gopher:// scheme in callback parameter; potential TCP connection from CUCM server to 127.0.0.1:6379 if exploitable
- Test 3SSRF Internal Network Scan via CUCM Redirect Parameter
Expected signal: Multiple HTTP requests to /ccmuser/ with varying port numbers in src parameter containing RFC1918 addresses; timing differences in responses may reveal open ports on internal hosts if CUCM is vulnerable
References (4)
- https://www.cisco.com/c/en/us/support/docs/csa/cisco-sa-cucm-ssrf-cXPnHcW.html
- https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk
- https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk
- https://nvd.nist.gov/vuln/detail/CVE-2026-20230
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